Bread baking can be complicated, partly due to all the variables involved in using yeast. There are several types of yeast you can use in baking, but two of the most common are active dry yeast and instant yeast, also called rapid-rise yeast. Instant yeast and active dry yeast involve some of the same preparation steps, but your total baking time will be shorter with instant yeast since it can significantly reduce the time it takes dough to rise.
How Instant Yeast Works
Instant yeast works more rapidly than active dry yeast. You won't notice immediate rising once you mix up your dough, but you should check its progress earlier than your recipe recommends. Instant yeast may cut the total rising time of your dough in half.